How to Upgrade Xiaomi Mi 9: Complete Guide to Installing MIUI 12.5

Owners of the legendary flagship 2019 often wonder about extending the life of their device, and the most effective way is to install the current version of the operating system. Despite the fact that the official support of the Xiaomi Mi 9 ended with the version of MIUI 12.5 based on Android 11, the correct update allows you to ensure stable application operation and close critical security vulnerabilities. The process can seem difficult for a beginner, but strict adherence to the instructions guarantees a successful result without losing data.

There are several firmware methods, each with different features and applications depending on the current state of your gadget. If your smartphone is switching on and working normally, it is better to use the standard method through the settings menu. However, in cases where the device is “hanging” on the logo or does not see the update through the air, more advanced tools will be required, such as manually installing the archive through Recovery Mode.

Before you start any manipulation of system files, it is essential to understand the risks and prepare the device for the procedure. Be sure to make a full backup of all important data, as in the event of a failure or interruption of the process, information can be irretrievably lost. In this article, we will discuss in detail all the steps, from checking the current version to forced installation of firmware.

Preparation of the smartphone for the update procedure

Start with a thorough check of the technical condition of the device, as the upgrade is a resource-intensive process that requires stable power and sufficient free memory. Charge Xiaomi Mi 9 to at least 60%, and preferably to 100%, so that a sudden shutdown does not lead to a critical error bootloader. Also make sure you use the original cable and power supply, as cheap counterparts may not provide the necessary current during active data recording.

Free up internal storage by deleting unnecessary files or moving them to your computer or the cloud. To properly unpack and install the firmware package, the system requires at least 3-4 GB of free space, even if the file itself weighs less. Lack of memory often causes the “failed to update” error at the most inopportune time.

⚠️ Note: Do not try to update the device if the screen has mechanical damage ("spots", stripes) that prevent you from seeing the image. During the reboot, you may need to confirm the action, and blind input may lead to the selection of the wrong menu item.

Check the stability of the Internet connection, as downloading large amounts of data through the mobile network can be interrupted due to an unstable signal. If you plan to manually install, download the firmware file to your computer in advance and prepare USB-plug-in.

Automatic update via OTA (over the air)

The easiest and safest way to get the latest software available for Xiaomi Mi 9 is to use the built-in OTA (Over-The-Air) mechanism, which independently checks the servers for new packages and suggests installing them if your current version is older than available.

To start the check, go to the settings menu and select About Phone. In the window that opens, click on the major icon of the MIUI version (for example, MIUI 12.0.3). The system will contact the server and, if an update is found, prompt you to click the Download button.

After downloading a file weighing about 2-3 GB, the phone will suggest restarting for installation. at this point the device will turn off, and the Android logo with a progress indicator will appear on the screen. The process can take from 5 to 15 minutes, during which it is strictly forbidden to touch buttons or remove the battery (which in the Mi 9 is impossible indiscriminately).

Often, users are faced with a situation where automatic search does not produce results, which may be due to the fact that updates come in waves, and your particular device has not yet received a digital signature to transition, in which case you should not panic - in a few days, this may change, or you will have to use manual methods.

Manual installation of firmware through Recovery Mode

If the automatic method didn’t work or you want to update forcefully, Recovery mode comes to the rescue. This method requires you to download the full firmware archive (Recovery ROM) from the official website or proven resources. The file must have the.zip extension and weigh about 2.5-3 GB.

Copy the downloaded file to the root of the phone's internal memory (not the folder, but directly to the main Explorer window). Rename the file to update.zip to make it easier to find, although modern versions of MIUI often find it with the original name. Make sure the file is not corrupted when downloaded - check the checksum if you have one.

Then you go into recovery mode. Turn off your smartphone completely, then press the Volume Up and Power buttons at the same time. Hold them until the Mi logo appears, then release the power button, but keep the volume up until the Recovery menu appears. In this menu, the navigation is done with volume buttons (up/down), and the selection is done with the power button.

Select Install Update.zip (or Install from internal storage). The system will ask you to confirm the action, agree. If the firmware is compatible with your model, the installation process will begin. Once completed, select Reboot to restart.

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If the phone hangs on the Mi or Android logos for a long time after installing the update, try pressing the power button for 10-15 seconds to force a reboot. If this doesn't help, you may need a complete data reset.

Solving Common Errors During Updating

The upgrade process doesn’t always go smoothly, and Xiaomi Mi 9 users may encounter a variety of bugs, one of the most common being “failed to update” or “file corrupted.” This often indicates that you’re trying to install global firmware on the Chinese version of the device (or vice versa) without first unlocking the bootloader.

Another common problem is Bootloop, where the phone is constantly rebooting without reaching the desktop, which can happen if you interrupt the file writing process or if there were broken sectors in memory, and in such cases, logging into Recovery and selecting the Wipe Data option often helps, but this will delete all your photos and contacts.

⚠️ Note: When switching from one version of Android to another (for example, from Android 10 to 11), it is strongly recommended to do a full reset (Wipe All Data.

If the phone doesn't respond to buttons at all and doesn't turn on, it may be "buzzy." The Mi 9 with a Snapdragon 855 processor is characterized by the ability to recover via EDL (Emergency Download Mode) mode, but this will require special Mi Account rights or paid services. So always double check if the firmware version is downloaded.

Also worth mentioning is the problem with drivers when connecting to a PC. If the computer does not see the phone in Recovery or Fastboot mode, install the official Qualcomm or ADB drivers. Without them, no manipulation through the computer is impossible.

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90% of update errors are due to trying to install the wrong firmware version (region or device type) and always check the model marking (e.g. cephues for the Global version).

Reset version and reset settings

Sometimes the new version of MIUI is not liked by the user due to changes in the interface or performance. Unlike many other brands, Xiaomi allows you to roll back (Downgrade) only to earlier versions, but with serious restrictions. Officially switch from MIUI 12 to MIUI 11 through the Recovery menu, the system will give an error "Can't validate update".

The rollback requires an unlocked bootloader and a computer with the Mi Flash Tool. This process is complex and requires the phone to be switched to Fastboot mode (clutching the Volume Down + Power button when the phone is off), in which the android repairer will appear on the screen.

If you do decide to reset or roll back, remember that this is an extreme measure. SIM-card and memory card (if it was supported, but it is not in the Mi 9) to avoid damage by software commands.

Once you successfully roll back or reset, the phone will be like new, without your accounts, apps, or settings, and you'll have to reset your initial setup, enter your password from your Google account (FRP protection) and your Mi Account, and if you don't remember your passwords, it's going to be extremely difficult to restore access to your device.

Frequently Asked Questions (FAQ)